*{
    margin: 0;
    padding: 0;
}

.header{
    border-bottom:1px solid #BBBBBB;
}

body{
    background-color: #F5F5F5;
}

.clear{

    clear: both;
}

/* 从middle开始 */
.middle{
    width: 90%;
    margin: 0 auto;
}

.middle .middle_top{
    min-height: 200px;
    width: 100%;
    background-color: #fff;
    margin: 5px auto;
    border: 1px solid #BBBBBB;
}

/* middle 左侧 image */
.middle .middle_top .image{
    float: left;
    height: 150px;
    background-color: #fff;
    width: 20%;
    margin-top: 25px;
    padding: 5px;
    box-shadow: 1px 1px 1px #bbb;
    text-align: center;
}

.middle .middle_top .image img{
    width: 100%;
    height: inherit;
}

/* middle 图片右侧 */
.middle .middle_top .desc{
    float: left;
    background-color: #fff;
    width: 75%;
    min-height: 200px;
    height: inherit;
    margin: 5px;
    padding: 5px;
}

.middle .middle_top .desc .desc_top{
    color: #222222;
    font-family: "Microsoft YaHei";
    font-size: 24px;
    font-weight: bold;
    text-align: left;
    padding: 5px;
    margin-top: 10px;
    margin-left: 10px;
    width: 100%;
    min-height: 40px;
}

.middle .middle_top .desc .desc_bottom{
    color: #000;
    font-family: "Microsoft YaHei";
    font-size: 14px;
    text-align: left;
    margin: 5px;
    width: 100%;
    height: 100px;
}

/*按钮 和 信息*/
.middle .middle_top .desc .desc_top h2{
    display: inline-block;
    float: left;
}
.middle .middle_top .desc .desc_top button{
    float: left;
    margin: 10px 100px;
    width: 128px;
    height: 48px;
    background-color: #D54F30;
    color: #fff;
    font-size: 16px;
    font-family: "Microsoft YaHei";
    font-weight: bold;
    line-height: 16px;
    border-radius: 2px;
    border-style: none;
    float: right;
}

.middle .middle_top .desc .desc_top button:hover{
    background-color: #d54120;
}

/*课程的属性*/
.middle .middle_top .desc .desc_bottom .desc_right
{
    float: left;
    width: 100%;
    height: 110px;
    text-align: center;
    margin-top: -10px;
    padding: 5px;
    background-color: #fff;
}

.middle .middle_top .desc .desc_bottom .desc_right .course_val_left,
.middle .middle_top .desc .desc_bottom .desc_right .course_val_right{
    min-width: 100px;
    float: left;
    text-align: left;
    font-size: 13px;
    margin: 5px;
    padding-left: 5px;
    border-left: 1px solid #BBBBBB;
}

.middle .middle_top .desc .desc_bottom .desc_right .course_val_left ul li,
.middle .middle_top .desc .desc_bottom .desc_right .course_val_right ul li{
    list-style-type: none;
    padding-left: 10px;
    margin-bottom: 5px;
    color: #555;
}

/*middle 下半部分*/
.middle .middle_bottom{
    min-height: 400px;
    height: auto;
    width: 100%;
    background-color: #fff;
    margin: 5px;
}

/* bottom - left */
.middle .middle_bottom .bottom_left{
    height: auto;
    float: left;
    width: 70%;
    margin: 5px;
    padding: 10px;
    background-color: #fff;
}

.middle .middle_bottom .bottom_left .course_brief{
    text-align: left;
    font-family: "Microsoft YaHei";
    color: #929292;
    font-size: 16px;
    letter-spacing: 1px;
    padding: 5px;
}

.middle .middle_bottom .bottom_left .course_menu{
    padding: 5px;
    height: 50px;
    border-bottom: 1px solid #BBBBBB;
}

.middle .middle_bottom .bottom_left .course_menu ul li{
    list-style-type: none;
    text-decoration: none;
    padding: 5px;
    margin: 10px;
    float: left;
    width: 80px;
    height: 30px;
    line-height: 30px;
    text-align: center;
}

.middle .middle_bottom .bottom_left .course_menu ul li a{
    text-decoration: none;
    font-weight: bold;
    font-family: "Microsoft YaHei";
    font-size: 18px;
    font-style: normal;
    color: #222222;
    cursor: pointer;
}

.middle .middle_bottom .bottom_left .course_menu ul li a:hover{
    color: #D54F30;
}


/* bottom - right */
.middle .middle_bottom .bottom_right{
    min-height: 300px;
    float: left;
    width: 20%;
    margin: 5px;
    padding: 10px;
    border: 1px solid #BBBBBB;
}

/* 讲师介绍 标头 */
.middle .middle_bottom .bottom_right h4{
    color: #000;
    font-size: 18px;
    font-family: "Microsoft YaHei";
    font-weight: bold;
    padding: 5px;
}

.middle .middle_bottom .bottom_right .teacher_info{
    height: 90px;
    padding: 5px;
    background-color: #fff;
    margin: 5px;
    border-bottom: 1px solid #BBBBBB;
}

/*讲师头像姓名*/
.middle .middle_bottom .bottom_right .teacher_info .teacher_icon{
    background-color: #fff;
    border-radius: 90%;
    overflow: hidden;
    margin: 5px;
    float: left;
}

.middle .middle_bottom .bottom_right .teacher_info .teacher_name{
    width: 50%;
    background-color: #fff;
    float: left;
    margin: 15px auto;
}

.middle .middle_bottom .bottom_right .teacher_info .teacher_name span{
    display: block;
    font-family: "Microsoft YaHei";
    padding: 5px;
}

.middle .middle_bottom .bottom_right .teacher_info .teacher_name .name_1{
    font-size: 16px;
}

.middle .middle_bottom .bottom_right .teacher_info .teacher_name .name_2{
    font-size: 14px;
}

/*老师详细介绍*/
.middle .middle_bottom .bottom_right .teacher_brief{
    background-color: #fff;
    padding: 10px;
    text-indent: 2em;
    font-family: "Microsoft YaHei";
    font-size: 15px;
    margin: 5px;
}

/*  imp!!!   4个选项   */
.middle .middle_bottom .bottom_left .course_mod{
    position: relative;
    height: auto;
    width: 100%;
}

/* 1. learn */
.middle .middle_bottom .bottom_left .course_mod .mod_learn{
    display: block;
    background-color: #fff;
    width: 100%;
    height: 300px;
}

.middle .middle_bottom .bottom_left .course_mod .mod_learn ul{
    margin-top: 10px;
    padding: 10px;
    height: auto;
    min-height: 60px;
}

.middle .middle_bottom .bottom_left .course_mod .mod_learn ul li{
    margin: 10px 20px;
    border-bottom: 1px solid #BBBBBB;
    width: 90%;
    text-align: left;
    letter-spacing: 2px;
    height: 30px;
    line-height: 30px;
    font-family: "Microsoft YaHei";
    font-size: 14px;
    color: #000;
    background-color: #fff;
    list-style-type: disc;
}

/* 2 comment */
.middle .middle_bottom .bottom_left .course_mod .mod_comment{
    display: none;
    width: 100%;
    min-height: 300px;
    margin: 10px 5px;
}

.middle .middle_bottom .bottom_left .course_mod .mod_comment ul{
    margin: 5px;
    height: auto;
}

.middle .middle_bottom .bottom_left .course_mod .mod_comment ul li{
    background-color: #fff;
    width: 100%;
    min-height: 80px;
    margin: 5px;
    padding: 5px;
    border-bottom: 1px solid #BBBBBB;
    list-style-type: none;
}

.middle .middle_bottom .bottom_left .course_mod .mod_comment .comment_desc{
    min-height: 70px;
    background-color: #fff;
    margin: 5px auto;
    display: inline-block;
    width: 100%;
}

.middle .middle_bottom .bottom_left .course_mod .mod_comment .comment_desc .comment_left{
    background-color: #929292;
    float: left;
    margin-top: -5px;
    overflow: hidden;
    border-radius: 100%;
}

.middle .middle_bottom .bottom_left .course_mod .mod_comment .comment_desc .comment_left img{
    width: 50px;
}

.middle .middle_bottom .bottom_left .course_mod .mod_comment .comment_desc .comment_right{
    width: 85%;
    background-color: #fff;
    float: left;
    margin: 5px;
    padding-left: 10px;
}

.middle .middle_bottom .bottom_left .course_mod .mod_comment .comment_desc .comment_right .right_title{
    margin-top: -5px;
    margin-left: 5px;
    margin-right: 5px;
    text-align: left;
    font-family: "Microsoft YaHei";
    font-style: normal;
    font-weight: 600;
    font-size: 14px;
    color: #222222;
}

.middle .middle_bottom .bottom_left .course_mod .mod_comment .comment_desc .comment_right p{
    margin: 5px;
    font-family: "Microsoft YaHei";
    font-weight: 500;
    font-size: 14px;
}

.middle .middle_bottom .bottom_left .course_mod .mod_comment .comment_desc .comment_right .right_bottom{
    margin: 5px;
    padding-top: 5px;
    font-family: "Microsoft YaHei";
    font-weight: 400;
    color: #222222;
    font-size: 13px;
}

/*点赞处*/
.middle .middle_bottom .bottom_left .course_mod .mod_comment .comment_desc .comment_right .right_bottom a{
    text-decoration: none;
    float: right;
    font-family: "Microsoft YaHei";
    font-weight: 600;
    color: #222222;
    font-size: 14px;
}

/*  评论区 */
.user_input_comment {
    padding: 5px;
    margin: 5px 15px;
    height: 80px;
    width: auto;
}

.user_input_comment span{
    display: inline-block;
    font-family: "microsoft yahei";
    font-size: 18px;
    font-weight: 600;
    margin: 5px;
    color: #000;
}

.user_input_comment .input_textArea{
    display: block;
    resize: none;
    margin: 2px 5px;
    height: 50px;
    width: 100%;
    border-radius: 3px;
    font-family: "Microsoft YaHei";
    font-size: 15px;
    color: #000;
    text-align:left;
}

.user_input_comment .input_button{
    display: block;
    width: 50px;
    height: 25px;
    float: right;
    margin: 5px 0px;
    text-align: center;
    font-family: "Microsoft YaHei";
    font-size: 14px;
    letter-spacing: 1px;
}

/* 3   不写了            */
.middle .middle_bottom .bottom_left .course_mod .mod_qa{
    display: none;
    margin: 5px;
    width: 100%;
    min-height: 300px;
    text-align: center;
    line-height: 200px;
    font-size: 24px;
    font-weight: bold;
    color: #666666;
}

/*   4   文件       */
.middle .middle_bottom .bottom_left .course_mod .mod_files{
    margin: 5px;
    width: 100%;
    height: auto;
    background-color: #fff;
    display: none;
}

.middle .middle_bottom .bottom_left .course_mod .mod_files ul{
    margin: 5px auto;
    height: auto;
}

.middle .middle_bottom .bottom_left .course_mod .mod_files ul li{
    margin: 5px;
    border-bottom: 1px solid #BBBBBB;
    width: 90%;
    min-height: 60px;
    background-color: #fff;
    list-style-type: none;
}

.middle .middle_bottom .bottom_left .course_mod .mod_files .file_desc .desc_title{
    margin: 5px;
    background-color: #fff;
    font-family: "Microsoft YaHei";
    font-size: 15px;
    font-weight: 500;
    color: #222222;
}

.middle .middle_bottom .bottom_left .course_mod .mod_files .file_desc a{
    margin: 5px;
    padding: 5px;
    font-family: "Microsoft YaHei";
    font-size: 15px;
    font-weight: 400;
}

.middle .middle_bottom .bottom_left .course_mod .mod_files .file_desc a:hover{
    color: #D54F30;
}

.middle .middle_bottom .bottom_left .course_mod .mod_files .file_desc .desc_bottom{
    margin: 5px;
    background-color: #fff;
    font-family: "Microsoft YaHei";
    font-size: 13px;
    font-weight: 500;
    color: #000;
}

.middle .middle_bottom .bottom_left .course_mod .mod_files .file_desc .desc_bottom span{
    margin-right: 30px;
}

/* 上传文件的iframe */
.upload_frame_div{
    border-radius: 2px;
    display: block;
    width: 100%;
    min-height: 120px;
    overflow: hidden;
    padding: 5px;
    margin-left: 5px;
    margin-top: 10px;
}

.upload_frame_div h3 {
    font-family: "Microsoft YaHei";
    font-weight: bold;
    font-size: 20px;
    color: #000;
    height: 25px;
    text-align: left;
    line-height: 25px;
    padding-left: 5px;
    margin: 10px auto;
    border-top: 1px solid #BBBBBB;
}
.upload_frame_div div{
    float: left;
    padding: 5px;
    margin-right: 10px;
    font-family: "microsoft yahei";
}
.upload_frame_div  span{
    margin: 0 5px;
}

.upload_frame_div .input_button{
    font-family: "Microsoft YaHei";
    width: 50px;
}


/* footer*/
.footer{
    float: none;
}